Brake



Aug. l29, 1933.

BRAKE Filed Aug. 26, 1929 INVENTOR f 1[fueaihna GM 9 DONALD AT ORNE Y E. G MCDONALD 1,924,613

A In one desirable arrangement means of the brake.

These `and otherobjects and features of the t ical springs 30 against friction washers 32, Wh ich compressedwashers and `bolts serve to 'frictionf; l

Patented Aug. vk19733i -BRAKEQ VEugene IG.' McDonald, South Bend,` Ind., as-

,signorl to Bendix Brake `Company,

Seuth Bendylnd., a corporatonof Illinois l Application August ze, 1929'. serialno. 388,304 1` claim. (ci. `18s- Jui `This invention relates to brakes and is illustrated as embodied in an of automobile brake.

An object of, theV invention resides in the provision of a'simple brake applyingdevice prefer-vv ably mounted to floatwith respect to the brake shoes or equivalent frictionelement to' equalize brake applying `pressures and also'designed to vary its throw by means of a novel eccentrically mounted two-part cam.

a brake applying shaft shown with a crank arm `at one end andprovided at its brake applying endf with a reduced spindle portion adapted tol ec-' centrically support spaced apart stampings With rollers therebetween constitutingv the camming invention,` including novel and desirable details of construction land combinations of parts will be'apparent from thefollowin'g description ofr the accomone illustrated embodiment shownin panying drawing, in which:

Figure 1 isa side elevation of the brake taken,

through vthe brakev drum flange just inside the Wheel; 1 Figure 2 is asection through my novel applying means taken on and l i l l l ,c

Figure 3 is a section'taken throughthe applying means taken on the line 3%3 of Figure l.

In the arrangement` selected forillustration, the brake includes a rotatablymounted drum 1`0 at the open side of Which may be arranged a backing plate or other support V12 v,and within lwhich are arranged a plurality of brakeshoesl three-shoe 14, 16 and 18 arrangedas usual'ina commercial type of` brake.

According to`an important feature of my invention, the spaced apart ends of the adjacent shoes 14 and 18, or theirv equivalent, are adapted ing plate through the intermediary of bolts 24, I

the headscof which'are adapted to pass through internal 'expanding type thereis providedv the lower portion thereof. f Y Accordingto oneimportant `minor-feature of i .the line of Figure 1`;5

The cam shaft 20 is preferably Vshouldered at its inner end to provide a'stubshaft ,or'spin'dle n36,which shaft servesas a supportfor Aparallel stampings 38 constituting the-end plates of my 'novel cam and secured. to' the spindle-by nut-39 and lock Washer 41. Itis to'be particularly noted that thelstub Yshaft lis eccentricallyfmounted l wthint'h'e cam plates, that is;V it is notpassed through the geometrical center thereof, thus providingadierent degree of throw for-5`each` of A'the-brake shoes 14 and 18, it being obvious that the-angular movement of the upper portionof the camis' greater than 'the angular movement of my invention, the stampings constituting the-,end

plates of 1the cam serveas bearings for shouldered Vspindles 40, which spindles'are adapted to support rollers 42 which contact L-shaped thrust 1. plates 44 riveted or otherwise secured to the Webs of the brake shoes orl equivalent structureyfand 1 whichl plates are straddled'byV thecam end plate`.

VInA operation, rotation ofthecam` shafth 20,*r

' preferably by means of afcrankarm'46, `ixedlyi secured to theend of the shaft serves to spread",-

apartthe brakeshoes, shoes 14 and,16Whicha1`fev pivotedfto move together, moving appvroximat elyk twice'as fast as the short shoe 18, thus insuring simultaneous drum contact of all offthe shoes of the brake. Byvirtue of the floating support for the cam shaft, the forces'distributed to the ends otth'eshoes are equal, thus insuring equal lin-f' v' `i n giv'vez-n" to the two sectionsv of thebrake.

intention to limitfthe invention toA that particular 'embodiment or otherwise than bythe scope v p of theappended claim. lIclaim: n l Brake-applying means comprising a s hiftablymounted bracliet having spaced ball bearings, a 'l j shaft journaled in said-bearings and having an f operating lever at one er1 d"a1 1dareduced-diam-` eter portionvat itsother en'df'a pair of :spaced f plates4 mounted-on the reduced-diameterporl' v tiona'nd a pairl of thrust rollers mounted` ber l tweenc said' plates `on opposite sides yof the shaft."V` slots v26 in the backing plate, which slots are of .l v g v v EUGENE G.*MCDONALD. greater length than the-bolt width.Nuts-28` j threaded on the ends ofthebolts compress heli;

the backing plate, While at the saine time allowing a floating or shifting vlateral movement thereof. 

